---I want someone to write the composition for me.

--- No. As a student,  you ____depend on yourself.

A．must

B．might

C．will

D．can

哪个勘探阶段应重点解决圈闭的识别和圈闭要素的确定问题（）

A.大区概査

B.盆地普查

C.区域详查

D.圈闭预探